KR101175217B1 - Communication system, mobility management network element, method for processing resource - Google Patents

Abstract

Provides resource processing methods, communication systems, and mobility management network elements. The resource processing method includes a release sent by an access network of a PS network when a mobility management network element of a packet switching (PS) network is handed over from a PS network to a circuit switching (CS) network. Receiving a request message or a Handoff Complete message sent by the CS network, and the mobility management network element of the PS network processes the resources of the user terminal (UE) in the PS network. According to this, when the UE is handed over from the PS network to the CS network, it is possible to process resources of the UE in the PS network. It also provides communication system and mobility management network elements.

Description

Resource handling methods, communication systems, and mobility management elements {COMMUNICATION SYSTEM, MOBILITY MANAGEMENT NETWORK ELEMENT, METHOD FOR PROCESSING RESOURCE}

TECHNICAL FIELD The present invention relates to the field of communications technologies, and more particularly, to a method, a communication system, and a mobility management network element for processing a resource.

Related application

The present application is a Chinese patent application No. 200810067044.0 filed on April 30, 2008, "Communication System, Mobility Management Network Element, Method for Processing Resource", and "Communication System," filed December 17, 2008 Priority is claimed to Chinese Patent Application No. 200810188447.0 entitled "Mobility Management Network Element, Method for Processing Resource", and the entire contents of the two patent documents are incorporated herein by reference.

FIG. 1 shows a conventional architecture of an interworking structure of a 3GPP packet switched network, which is a third generation international standardization organization, and a CDMA2000 1x network of a code division multiple access (CDMA) network. Referring to Figure 1, this architecture includes an evolved UMTS terrestrial radio access network (E-UTRAN) adapted to implement all the functions related to the radio of an evolved network; A mobility management entity (MME) that performs mobility management on the control side including distributing temporary user IDs as well as user context management and mobility status management; A serving gateway (SGW) serving as an anchor point between the 3GPP access networks and terminating the interface of the E-UTRAN; A user side anchor point between 3GPP access networks, and includes a packet data network gateway (PGW) for terminating an interface with an external packet data network (PDN).

The UMTS terrestrial radio access network (UTRAN) and GSM / EDGE radio access network (GERAN) can implement all radio related functions in the existing GPRS / UMTS network. The serving GPRS supporting node (SGSN) is configured to perform functions such as routing, forwarding, mobility management, session management, and user information storage in the GPRS / UMTS network. It is.

A 1x circuit switched domain access network is intended to perform radio-related functions in a CDMA2000 1x network. The 1x CS mobile switching center (MSC) is designed to provide mobility management and switching for mobile users and to enable interworking between mobile users as well as between mobile and fixed users. The interworking solution function (IWS) encapsulates 1x CS signaling from 1x CS MSC and transmits the encapsulated 1x CS signaling to user equipment (UE) via 3GPP PS network. Or, the UE performs the function of exchanging and relaying 1x CS signaling to transmit the encapsulated 1x CS signaling to the IWS through the 3GPP PS network and to relay the encapsulated 1x CS signaling to the 1x CS MSC. It is. IWS is also known as 1x CS IWS.

Among the prior arts, a technique for handing over to a CDMA2000 1x network based on voice over IP (VoIP) service in the 3GPP PS network is proposed to ensure interworking between the 3GPP PS network and the original CS network. It is. FIG. 2 is a signal flow illustrating a process for handover from a 3GPP PS network to a CDMA2000 1x network using a VoIP service of a UE in the prior art. Referring to Figure 2, the process is as follows:

1. There is a VoIP session on the 3GPP PS network.

2. The access network of the 3GPP PS network determines the handover to CDMA2000 1x. The access network of the 3GPP PS network may be E-UTRAN, GERAN, or UTRAN.

3. The access network of the 3GPP PS network sends a relocation indication for notifying the UE to perform handover between systems.

4. The UE sends a 1x Origination message to the 1x CS IWS via the 3GPP PS network. That is, the UE sends an 1x Origination message to the access network of the 3GPP PS network, the access network of the 3GPP PS network encapsulates the 1x Origination message into an Uplink CDMA2000 Tunnel message, and the Uplink CDMA2000 Tunnel message to 3GPP. Sent to the mobility management network element of the PS network. For GERAN / UTRAN network, the mobility management network element of 3GPP PS network is SGSN, and for E-UTRAN, mobility management network element of 3GPP PS network is MME. After receiving the Uplink CDMA2000 Tunnel message, the mobility management network element of the 3GPP PS network acquires a 1x Origination message from the received Uplink CDMA2000 Tunnel message and sends the obtained 1x Origination message to the 1x CS IWS.

5. The IWS sends a CM Service Request message to the 1x CS MSC.

6. The MSC sends an Assignment Request message to the IWS.

7. The IWS sends a Handoff Direction message to the UE via the 3GPP PS network. That is, the IWS sends a Handoff Direction message to the mobility management network element of the 3GPP PS network. The mobility management network element of 3GPP PS network sends Downlink CDMA2000 Tunnel message (Handoff Direction message is encapsulated in this message) to access network of 3GPP PS network. The access network of the 3GPP PS network relays a Handoff Direction message to the UE.

8. The UE is handed over to the CDMA 1x network, and a traffic channel acquisition (TTC) process is performed to acquire a traffic channel.

9. The UE sends a 1x Handoff Complete message to the CDMA2000 1x access network.

10. The CDMA2000 1x access network sends a Handoff Complete message or an Assignment Complete message to the MSC.

11. A voice call is established on the CDMA2000 1x network.

From the above process, in the current mechanism for handover from the 3GPP PS network to the CDMA2000 1x network, when the UE becomes a CDMA2000 1x network from the 3GPP PS network, a mechanism for processing of resources in the PS network associated with the UE is provided. You can see that it is not. The same problem also occurs when the UE is handed over from another PS network to another CS network similar to the CDMA2000 1x network.

An embodiment of the present invention provides a resource processing method for processing a resource of a UE in a PS network when the UE is handed over from a PS network to a CS network.

A mobility management network element of a packet switched network (PS) is a case where a user equipment (UE) is handed over from a PS network to a circuit switched network (CS). Receives a Release Request message sent by an access network of a PS network or a Handoff Complete message sent by a CS network, and receives resources of a user terminal (UE) in the PS network. Process.

According to the resource processing method provided by the embodiment of the present invention, the mobility management network element of the PS network may include a Release Request message sent by the access network of the PS network or a Handoff Complete message sent by the CS network. Receiving a Handoff Completed) message, by initiating processing for resources of the UE in the PS network, when the UE is handed over from the PS network to the CS network, processing of the resources of the UE in the PS network can be performed.

An embodiment of the present invention provides a communication system for processing resources of a UE in a PS network when the UE is handed over from a PS network to a CS network.

The communication system of the present invention includes a mobility management network element of the PS network and an access network of the PS network, and when the UE is handed over from the PS network to the CS network, the access network of the PS network is connected to the mobility management network element of the PS network. It sends a Release Request message, and the mobility management network element of the PS network receives a Release Request message sent by the access network of the PS network, and releases resources of a user terminal (UE) in the PS network. It is supposed to be processed.

According to the communication system according to the embodiment of the present invention, the access network of the PS network sends a Release Request message to the mobility management network element of the PS network, and the mobility management network element of the PS network is sent by the access network of the PS network. Upon receipt of the released Release Request message, the processing of the resources of the UE in the PS network can be initiated so that the processing of the resources of the UE in the PS network can be performed when the UE is handed over from the PS network to the CS network. have.

Embodiments of the present invention provide another communication system capable of processing resources of a UE in the PS network when the UE is handed over from the PS network to the CS network.

The communication system of the present invention includes a mobility management network element of the PS network and a CS network, and when the UE is handed over from the PS network to the CS network, the CS network is connected to the mobility management network element of the PS network. It is intended to send a Handoff Complete message, and the mobility management network element of the PS network is configured to process resources of the UE in the PS network after receiving the Handoff Complete message sent by the CS network. It is.

According to the communication system according to the embodiment of the present invention, when the CS network sends a Handoff Complete message to the mobility management network element of the PS network, and the mobility management network element of the PS network receives a Handoff Complete message sent by the CS network, By initiating the processing of the resources of the UE in the PS network, when the UE is handed over from the PS network to the CS network, the processing of the resources of the UE in the PS network can be performed.

An embodiment of the present invention provides a mobility management network element in a PS network to process resources of the UE in the PS network when the UE is handed over from the PS network to the CS network.

The mobility management network element includes a receiving unit and a resource processing unit. The receiving unit is a Release Request message sent by the access network of the PS network or a Handoff Complete sent by the CS network when the UE is handed over from the PS network to the circuit switching (CS) network. Receive a (Handoff Completed) message. After the receiving unit receives the Release Request message sent by the access network of the PS network or the Handoff Complete message sent by the CS network, the resource processing unit (UE) in the PS network (UE) ) To process resources.

According to the mobility management network element according to the embodiment of the present invention, when the UE is handed over from the PS network to the CS network, it is sent by a Release Request message or a CS network sent by the access network of the PS network. Received Handoff Complete message, and the resource processing unit is configured to receive a Release Request message sent by the access network of the PS network or a Handoff Complete message sent by the CS network. After receiving the message), by processing the resources of the UE in the PS network, when the UE is handed over from the PS network to the CS network, processing of the resources of the UE in the PS network can be performed.

1 shows an interworking structure of a CDMA2000 1x network in a conventional 3GPP PS network and a CDMA network.
2 illustrates a signal flow of a process for handover from a 3GPP PS network to a CDMA2000 1x network based on a VoIP service of a conventional UE.
3 is a flowchart of a resource processing method according to an embodiment of the present invention.
4 is a flowchart of a resource processing method according to another embodiment of the present invention.
5 is a flowchart of a resource processing method according to another embodiment of the present invention.
7 illustrates a signal flow of a resource processing method when a UE is handed over from a PS network to a CDMA2000 1x network according to an embodiment of the present invention.
8 illustrates a signal flow of a resource processing method when a UE is handed over from a PS network to a CDMA2000 1x network according to another embodiment of the present invention.
9 illustrates a signal flow of a resource processing method when a UE is handed over from a PS network to a CDMA2000 1x network according to another embodiment of the present invention.
10 shows a structure of a communication system according to an embodiment of the present invention.
11 shows a structure of a communication system according to another embodiment of the present invention.
12 illustrates a structure of a mobility management network element in a PS network according to an embodiment of the present invention.
13 shows a structure of a mobility management network element in a PS network according to another embodiment of the present invention.

In an embodiment of the present invention, in the case of a GERAN / UTRAN network, a mobility management network element (PS) of a packet switched network may be a serving GPRS supporting node (SGSN). In the case of E-UTRNA, the mobility management network element of the PS network may be an MME.

In an embodiment of the present invention, the CS network to which the user equipment (UE) can be handed over from the PS network may be a CDMA2000 1x network, a GSM network, or another CS network.

3 is a flowchart of a resource processing method according to an embodiment of the present invention. Referring to Figure 3, the method is performed as follows:

In step 31, when the UE is handed over from the PS network to the CS network, the mobility management network element of the PS network receives a Release Request message sent from the access network of the PS network.

In step 32, the mobility management network element of the PS network processes resources of the UE in the PS network.

4 is a flowchart of a resource processing method according to another embodiment of the present invention. Referring to FIG. 4, the method is performed as follows:

In step 41, the mobility management network element of the PS network sends a Handoff Direction message to the access network of the PS network.

In step 42, the access network of the PS network sends a Release Request message to the mobility management network element of the PS network after receiving the Handoff Direction message.

In step 43, the mobility management network element of the PS network receives a Release Request message sent by the access network of the PS network.

In step 44, the mobility management network element of the PS network processes resources of the UE in the PS network.

In this embodiment, the access network of the PS network determines that the UE has been handed over based on a Handoff Direction message sent by the mobility management network element of the PS network, and initiates the release request message to operate. The mobility management network element of performs processing of resources of the UE in the PS network.

5 is a flowchart of a resource processing method according to another embodiment of the present invention. Referring to FIG. 5, the method is performed as follows:

In step 51, the mobility management network element of the PS network sends a Handoff Direction message to the UE via the access network of the PS network.

In step 52, after receiving the Handoff Direction message, the UE sends a Radio Resource Control (RRC) Release Request message to the access network of the PS network. The RRC Release Request message may be instructed to release the RRC connection for the access network of the PS network. The RRC Release Request message sent by the UE may include indication information indicating that the RRC Release Request message is generated by handing over the UE to the CS network. For example, the UE may include a "Cause" information element (IE) in the Release Request message, and the value of the IE is set to "Handover Triggered" or the UE is included in the Release Request message. It may include a "Handover Triggered Indicator" IE.

In step 53, the access network of the PS network sends a Release Request message to the mobility management network element of the PS network after receiving the RRC Release Request message.

In step 54, the mobility management network element of the PS network receives a Release Request message sent by the access network of the PS network.

In step 55, the mobility management network element of the PS network processes the resources of the UE in the PS network.

In this embodiment, upon receiving the Handoff Direction message sent by the network side, i.e., when the UE completes establishing CS network access through the PS network and waits for a handover to the CS network, the UE initiates a release process. In addition, the RRC Release Request message is sent to the access network of the PS network, indicating that the resources of the UE in the PS network can be processed. After receiving the RRC Release Request message sent by the UE, the access network of the PS network sends a Release Request message to the mobility management network element of the PS network. Thereby, the mobility management network element of the PS network processes the resources of the UE in the PS network.

In steps 31, 42 and 53 in the above embodiment, the Release Request message sent by the access network of the PS network may include indication information indicating that the Release Request was made by handing over the UE to the CS network. Can be. For example, the UE may include a "Cause" IE in the Release Request message, and the value of the IE may be set to "Handover Triggered" or the access network of the PS network may be "Handover Triggered" in the Release Request message. Indicator "(handover trigger indication) IE may be included.

After receiving the Release Request message sent by the access network of the PS network, the Release Request message is included in the Release Request message by the mobility management network element of the PS network to indicate that the Release Request has been made by handing over the UE to the CS network. If found, the mobility management network element of the PS network handles the resources of the UE in the PS network.

6 is a flowchart of a resource processing method according to another embodiment of the present invention. Referring to FIG. 6, the method is performed as follows:

In step 61, when the UE is handed over from the PS network to the CS network, the mobility management network element of the PS network receives a Handoff Complete message sent from the CS network.

In step 62, the mobility management network element of the PS network processes the resources of the UE in the PS network.

In step 61, the mobility management network element of the PS network may be subjected to the processing of receiving a Handoff Complete message sent by the CS network as follows according to the specific configuration of the network equipment:

When the IWS between the CS network and the PS network is integrated into the access network element of the CS network, the access network element of the CS network receives a Handoff Complete message sent by the UE, and then sends a Handoff Complete message to the mobility management network element of the PS network. Send it.

In contrast, if the IWS between the CS network and the PS network is integrated into the mobility management network element of the PS network, the CS network mobility management network element receives the Handoff Complete message sent by the access network element of the CS network, and then the PS network. Sends a Clear Command message to the Mobility Management Network element In this case, after the mobility management network element of the PS network receives the Clear Command message, the IWS in the mobility management network element of the PS network may convert the Clear Command message into a Handoff Complete message. Alternatively, the mobility management network element of the PS network may consider that the Handoff Complete message has been received and perform a subsequent process after receiving the Clear Command message.

In contrast, when the IWS between the CS network and the PS network is an independent network element, the mobility management network element of the CS network receives a Clear Command message to the IWS after receiving the Handoff Complete message sent by the access network element of the CS network. The IWS sends a Handoff Complete message to the mobility management network element of the PS network.

On the contrary, if the IWS between the CS network and the PS network is integrated into the mobility management network element of the CS network, the mobility management network element of the PS network receives a Handoff Complete message sent by the mobility management network element of the CS network.

In the case of the CDMA2000 1x network, the mobility management network element of the CS network may be 1x CS MSC.

In the present embodiment, when the UE is handed over from the PS network to the CS network, the mobility management network element of the PS network determines that the UE has successfully handed over to the CS network according to the Handoff Complete message sent by the CS network, and the PS Initiate processing of resources of the UE in the network.

In steps 32, 44, 55 and 62 of the above embodiment, the mobility management network element of the PS network processes one of the following schemes in processing resources of the UE in the PS network.

The mobility management network element of the PS network implies an implicit user separation process for detaching the UE from the PS network (i.e., the network side sends a Detach message to notify that the UE is detached after the UE is detached from the network side). Need not be sent].

In contrast, the mobility management network element of the PS network does not initiate separation of the UE, reserves all bearers of the UE in the PS network, and instructs the SGW to hold the bearer.

Alternatively, the mobility management network element of the PS network does not initiate detachment of the UE and, according to the type of bearer, initiates a bearer deletion process of deleting some bearers and retaining other bearers. , Instructs the SGW to hold the reserved bearer. For example, in the case of a Guaranteed Bit Rate (GBR) bearer, the mobility management network element of the PS network initiates a bearer deletion process for deleting a GBR bearer, and in the case of a non-GBR bearer, The mobility management network element reserves the non-GBR bearer and instructs the SGW to hold the non-GBR bearer. Dedicated network resources need to be distributed to GBR bearers, but not to non-GBR bearers. This is because non-GBR bearers may share network resources with some other bearers. By doing so, as the GBR bearer is deleted, dedicated network resources can be released in a timely manner. Because it prevents the waste of network resources, non-GBR bearers that share network resources with some other bearers are suspended.

In contrast, in the case of a VoIP bearer, the mobility management network element of the PS network initiates a bearer deletion process for deleting the VoIP bearer, and in the case of a bearer other than the VoIP bearer, the mobility management network element of the PS network is different from the VoIP bearer. Reserve the bearer and instruct the SGW to hold a bearer other than VoIP. By doing so, the UE's first voice bearer in the PS network can be released in time, and other non-voice bearers can be reserved and withheld. Thus, after returning to the PS network, the UE can continue to provide service to the user.

In this embodiment of the present invention, if the mobility management network element of the PS network needs to delete some bearers and reserve some other bearers, depending on the bearer type, one of the following manners may be used. :

(1) The mobility management network element of the PS network may instruct the SGW to hold all bearers of the UE, and depending on the type of bearer, the mobility management network element of the PS network may have some bearers (eg, non- Reserve a GBR bearer and initiate a bearer deletion process to delete some other bearer (eg, GBR bearer).

(2) The mobility management network element of the PS network deletes some bearers (e.g., GBR bearers) and reserves some others (e.g., non-GBR bearers), depending on the type of bearer. Instruct the SGW to withhold the reserved bearer. SGW suspends a bearer that is reserved and, after receiving a Suspend Bearer message, deletes the bearer that is reserved (ie, the SGW deletes a bearer that is not held, for example, deletes a GBR bearer). .

(3) The mobility management network element of the PS network deletes some bearers (e.g., GBR bearers), and reserves some other bearers (e.g., non-GBR bearers), depending on the type of bearer. , Instructs the SGW to suspend all bearers of the UE. After receiving the Suspend Bearer message, the SGW deletes some bearers (eg, GBR bearers) and suspends reserved bearers (eg, non-GBR bearers), depending on the type of bearer. In this way, the SGW and mobility management network elements need to have the same bearer processing rules.

(4) The mobility management network element of the PS network, depending on the type of bearer, deletes some bearers, reserves some others, and instructs the SGW to suspend the reserved bearers and delete the non-reserved bearers. . This process can be realized in one of four ways.

Method 1: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the status of the bearer, the ID of the bearer to be deleted, and the ID of the bearer to be held. The state of the bearer to be held is set to "suspend", and the state of the bearer to be deleted is set to "delete". After receiving the Update Bearer Request message, the SGW suspends the bearer corresponding to the ID of the bearer in the "suspend" state and deletes the bearer corresponding to the ID of the bearer in the "delete" state. do.

In this way, the content contained in the Update Bearer Request message is, for example:

Bearer ID 1, Suspend

Bearer ID 2, Suspend

Bearer ID 3, Delete

Bearer ID 4, Delete

Method 2: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes a suspend list of IDs of bearers to be suspended and a delete list of IDs of bearers to be deleted. After receiving the Update Bearer Request message, the SGW withholds the bearer corresponding to the pending list and deletes the bearer corresponding to the deletion list.

In Method 2, the content contained in the Update Bearer Request message is, for example:

Suspend List:

Bearer ID 1

Bearer ID 2

Delete List

Bearer ID 3

Bearer ID 4

Method 3: The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes a pending list of IDs of bearers to be suspended and a deletion list of IDs of bearers to be deleted. After receiving the Suspend Bearer Request message, the SGW sets the status of the bearer corresponding to the pending list to "suspend" and deletes the bearer corresponding to the deletion list.

Method 4: The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes a deletion list consisting of the ID of the UE and the ID of the bearer to be deleted. After receiving the Suspend Bearer Request message, the SGW deletes the bearer corresponding to the deletion list and suspends other bearers.

The mobility management network element of the PS network instructs the SGW to hold the bearer to be held in four ways as described below.

Method 1: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the ID of the bearer to be held and the status of the bearer, and the status of the bearer is set to "suspend". After receiving the Update Bearer Request message, the SGW suspends the bearer corresponding to the ID of the bearer.

Method 2: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the state of the bearer and the ID of the UE, and the state of the bearer is set to "suspend". The SGW, after receiving the Update Bearer Request message, suspends all bearers of the UE.

Method 3: The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message contains the ID of the bearer to hold. After receiving the Suspend Bearer Request message, the SGW sets the state of the bearer corresponding to the bearer ID to "suspend".

Method 4: The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes the ID of the UE. After receiving the Suspend Bearer Request message, the SGW sets the state of all bearers of the UE to "suspend".

After holding the bearer, the SGW receives the downlink data packet for the held bearer without triggering paging. The SGW may buffer these downlink data packets and may also release resources used by the held bearers between the SGW and the downlink user side network elements, for example the downlink TEID used by the held bearers. have. For example, in the case of an E-UTRAN network, the SGW releases resources between the SGW and the eNodeB, and in the case of a UTRAN network, the SGW releases resources between the Radio Network Controller (RNC) or the 3G SGSN. In the case of a GERAN network, the SGW releases resources with the 2G SGSN.

A process for handing over a UE from a PS network to a CDMA2000 1x network will be described in detail below. Since the basic processing and processing mechanisms for other CS networks, such as GSM CS networks, are the same or similar, detailed description is omitted.

7 illustrates a signal flow for a resource processing method when a UE is handed over from a PS network to a CDMA2000 1x network according to an embodiment of the present invention. Referring to Fig. 7, the method is specifically performed as follows.

In step 71, there is a VoIP session in the PS network.

In step 72, the access network of the PS network determines to hand over to the CDMA2000 1x network. The access network of the PS network may be E-UTRAN, GERAN, or UTRAN.

In step 73, the access network of the PS network issues a relocation indication for notifying the UE to perform intersystem handover.

In step 74, the UE sends a 1x Origination message to the 1x CS IWS via the PS network. That is, the UE sends an 1x Origination message to the access network of the PS network, and the access network of the PS network transmits an Uplink CDMA2000 Tunnel message (1x Origination message is encapsulated within this message) to the mobility management network element (GERAN / UTRAN) of the PS network. In this case, the mobility management network element of the PS network is SGSN, and in the case of E-UTRAN, the mobility management network element of the PS network is MME). After receiving the Uplink CDMA2000 Tunnel message, the mobility management network element of the PS network acquires a 1x Origination message from the received Uplink CDMA2000 Tunnel message and sends the obtained 1x Origination message to the 1x CS IWS.

In step 75, the IWS sends a CM Service Request message to the 1x CS MSC.

In step 76, the MSC sends an Assignment Request message to the IWS.

In step 77, the IWS sends a Handoff Direction message to the UE via the PS network. That is, the IWS sends a Handoff Direction message to the mobility management network element of the PS network, and the mobility management network element of the PS network transmits a Downlink CDMA2000 Tunnel message (Handoff Direction message is encapsulated within this message) to the access network of the PS network. The access network of the PS network forwards a Handoff Direction message to the UE.

In step 78, the UE sends an RRC Release Request message to the access network of the PS network before handing over to the CDMA 1x network. The UE includes the indication information in the RRC Release Request message, which indicates to the access network of the PS network that the RRC connection release is made by handover. For example, the UE includes a "Cause" information element (IE) in the RRC Release Request message, and the value of the IE is set to "Handover Triggered" or the UE is set in the RRC Release Request message. It may include a "Handover Triggered Indicator" IE.

In step 79, the access network of the PS network sends a release request message to the mobility management network element of the PS network after receiving the RRC Release Request message. In the case of E-UTRAN, the release request message is an S1 UE Context Release Request message, and in the case of UTRAN / GERAN, the release request message is an Iu Release Request message. The access network of the PS network includes indication information in a Release Request message, which indicates to the mobility management network element of the PS network that a handover of the UE has been performed by the release request. For example, the access network of the PS network includes a "Cause" IE in the Release Request message, the value of the IE is set to "Handover Triggered", or the access network of the PS network sets a "Handover Triggered Indicator" in the Release Request message. Include.

In step 710, the mobility management network element of the PS network manages the resources of the UE in the PS network after receiving the message. The mobility management network element of the PS network can process resources as follows.

(1) The mobility management network element of the PS network initiates an implicit user separation process for separating the UE from the PS network. If the UE is detached from the PS network, the bearer is deleted from the PS network. In this case, as shown in FIG. 7, the mobility management network element of the PS network only needs to send a Delete Bearer Request message to the SGW. The SGW interacts with the PDN GW to delete bearers associated with the UE.

(2) The mobility management network element of the PS network does not separate the UE (ie, reserves the MM context of the UE). In the case of a GBR bearer, the mobility management network element of the PS network initiates a bearer deletion process for deleting a bearer. That is, a Delete Bearer Request message is sent to the SGW. In the case of non-GBR bearers, the mobility management network element of the PS network reserves these bearers and instructs the SGW to withhold these bearers.

(3) The mobility management network element of the PS network does not separate the UE (ie, reserves the MM context of the UE). In the case of a VoIP bearer, the mobility management network element of the PS network initiates a bearer deletion process for deleting a bearer. That is, a Delete Bearer Request message is sent to the SGW. For some other bearers, the mobility management network element of the PS network reserves these bearers and instructs the SGW to hold these bearers.

(4) The mobility management network element of the PS network does not separate E (ie, reserves the MM context of the UE). For the bearer, the mobility management network element of the PS network reserves the bearer and instructs the SGW to hold the bearer.

The mobility management network element of the PS network may instruct the SGW to hold the bearer in the following manner.

(a) The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. For each bearer to withhold, the Update Bearer Request message includes the bearer's ID and the bearer's status. The mobility management network element of the PS network sets the state of the bearer to "suspend".

(b) The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. This message contains the ID of the UE and the status of the bearer. The mobility management network element of the PS network sets the state of the bearer to "suspend", and the SGW sets the state of all bearers of the UE to "suspend".

(c) The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. For each bearer to withhold, the Suspend Bearer Request message contains the bearer's ID. After receiving the Suspend Bearer Request message, the SGW sets the state of the bearer corresponding to the ID to "suspend".

(d) The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. This message contains the ID of the UE. After receiving the Suspend Bearer Request message, the SGW sets the state of all bearers of the UE to "suspend".

In step 711, the UE is handed over to the CDMA2000 1x network and a TCC procedure is performed to obtain a traffic channel.

In step 712, the UE sends a 1x Handoff Complete message to the CDMA2000 1x access network.

In step 713, the CDMA2000 1x access network sends a Handoff Complete message or an Assignment Complete message to the MSC.

In step 714, a voice call is established in the CDMA2000 1x network.

In this embodiment of the present invention, if the mobility management network element of the PS network needs to delete some bearers and reserve some other bearers according to the bearer type, one of the following methods may be used. :

(1) The mobility management network element of the PS network may instruct the SGW to hold all bearers of the UE. The mobility management network element of the PS network reserves some bearers (eg, non-GBR bearers), and deletes other bearers (eg, GBR bearers) according to the bearer type. Initiate.

(2) the mobility management network element of the PS network deletes some bearers (e.g., GBR bearers), and reserves some other bearers (e.g., non-GBR bearers), depending on the type of bearer, Instructs the SGW to withhold a reserved bearer. After receiving the Suspended Bearer message, the SGW withholds the reserved bearer and deletes the unbeared bearer (ie, the SGW deletes the unbeared bearer, eg, the GBR bearer).

(3) the mobility management network element of the PS network deletes some bearers (e.g., GBR bearers), and reserves some other bearers (e.g., non-GBR bearers), depending on the type of bearer, Instructs the SGW to hold all bearers of the UE. After receiving the Suspended Bearer message, the SGW deletes some bearers (eg, GBR bearers), and reserves the reserved bearers (eg, non-GBR bearers), depending on the type of bearer. In this way, the SGW and mobility management network elements need to have the same bearer processing rules.

(4) The mobility management network element of the PS network, depending on the type of bearer, deletes some bearers, reserves some others, and instructs the SGW to suspend the reserved bearers and delete the non-reserved bearers. . This method can be realized in one of the following four ways.

Method 1: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the ID of the bearer to be held, the ID of the bearer to be deleted, and the bearer status. The state of the bearer to be held is set to "suspend", and the state of the bearer to be deleted is set to "delete". After receiving the Update Bearer Request message, the SGW suspends the bearer corresponding to the ID of the bearer in the "suspend" state and deletes the bearer corresponding to the ID of the bearer in the "delete" state. .

Method 2: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes a pending list of IDs of bearers to be held and a deletion list of IDs of bearers to be deleted. After receiving the Update Bearer Request message, the SGW suspends the bearer corresponding to the pending list and deletes the bearer corresponding to the deletion list.

Method 3: The mobility management network element of the PS network sends a Suspended Bearer Request message to the SGW. The Suspended Bearer Request message includes a pending list consisting of IDs of bearers to be held and a deletion list consisting of IDs of bearers to be deleted. After receiving the Suspended Bearer Request message, the SGW sets the status of the bearer corresponding to the pending list to "suspend" and deletes the bearer corresponding to the deletion list.

Method 4: The mobility management network element of the PS network sends a Suspended Bearer Request message to the SGW. The Suspended Bearer Request message includes a deletion list consisting of the ID of the UE and the ID of the bearer to be deleted. After receiving the Suspended Bearer Request message, the SGW deletes the bearer corresponding to the deletion list and suspends other bearers.

According to the above embodiment, upon receiving a Handoff Direction message sent by the CDMA2000 1x access network, that is, when the UE completes construction of the CDMA2000 1x access network through the PS network and is ready to be handed over to the CDMA2000 1x access network, the UE Initiates the release process and sends an RRC Release Request message to the access network of the PS network to indicate to the network that resources of the UE in the PS network can be processed. After the access network of the PS network receives the RRC Release Request message sent by the UE, it sends a Release Request message to the mobility management network element of the PS network, whereby the mobility management network element of the PS network manages the resources of the UE in the PS network. It can be processed.

8 is a signal flow diagram of a resource processing method when a UE is handed over from a PS network to a CDMA2000 1x network according to another embodiment of the present invention. Referring to FIG. 8, the method is performed as follows:

Steps 81 to 87 correspond to steps 71 to 77 in the above-described embodiment, respectively.

In step 88, the access network of the PS network receives a Downlink CDMA2000 Tunnel message (the Handoff Direction message is encapsulated within this message) sent by the mobility management network element of the PS network, i.e., to the mobility management network element of the PS network. After receiving the Handoff Direction message sent by the MS, it sends a release request message to the mobility management network element of the PS network. In the case of an E-UTRAN network, the release request message is an S1 UE Context Release Request message, and in the case of a UTRAN / GERAN network, the release request message is an Iu Release Request message. The access network of the PS network includes in the Release Request message, indication information for indicating to the mobility management network element of the PS network that the Release Request is made by handing over the UE. For example, the access network of the PS network includes a "Cause" information element (IE) in the Release Request message, and the value of the IE is set to "Handover Triggered" or the access of the PS network. The network may include a "Handover Triggered Indicator" IE in the Release Request message.

Steps 89 to 813 correspond to steps 710 to 714 of the above-described embodiment, respectively.

In the present embodiment, the access network of the PS network determines that the UE is handed over according to the Handoff Direction message sent by the mobility management network element of the PS network, and initiates a Release Request message, whereby the mobility management network element of the PS network is It can handle the resources of the UE in the PS network.

9 illustrates a signal flow for a resource processing method when a UE is handed over from a PS network to a CDMA2000 1x network according to another embodiment of the present invention. Referring to Figure 9, the method is performed as follows:

Steps 91 to 97 correspond to steps 71 to 77 in the above-described embodiment, respectively.

Steps 98 to 911 correspond to steps 711 to 714 in the above-described embodiment, respectively.

In step 912, after the UE is handed over to the CDMA2000 1x network, the 1x CS MSC receives the Assignment Complete message (shown in the figure) sent by the 1x CS access network element or is sent by the 1x CS access network element. After receiving the 1x Handoff Complete message (not shown in the figure, but can be replaced with the Assignment Complete message), a Clear Command message is sent to the IWS.

In step 913, the IWS sends a Handoff Complete message to the mobility management network element of the PS network after receiving the Clear Command message.

In step 914, the mobility management network element of the PS network determines that the UE is handed over after receiving the Handoff Complete message sent by the IWS, and manages the resources of the UE in the PS network. Since the processing method used by the mobility management network element of the PS network for managing the resources of the UE in the PS network is the same as that described in step 710, redundant description is omitted.

In this embodiment, when the UE is handed over from the PS network to the CS network, the mobility management network element of the PS network determines that the UE has been successfully handed over to the CS network according to the Handoff Complete message sent by the CS network, and the PS Processing of the resources of the UE in the network takes place.

In the embodiment shown in FIG. 9, the IWS is an independent network element mainly performing a function of exchanging and relaying 1x CS signaling, encapsulating 1x CS signaling from 1x CS MSC, and encapsulating 1x CS signaling through a PS network. Either send to the UE or otherwise the UE sends the encapsulated 1x CS signaling to the IWS via the PS network, and the IWS relays the encapsulated 1x CS signaling to the 1x CS MSC. In a specific embodiment, the functionality of the IWS may be integrated with other network elements in the network to form an integrated network element. In this case, in the embodiment shown in FIG. 9, in steps 912 and 913, the process of receiving the Handoff Complete message sent by the CS network by the mobility management network element of the PS network may be as follows:

(1) When the IWS is integrated with the 1x CS access network element, the IWS / 1x CS access network element receives a Handoff Complete message or an Assignment Complete message to the mobility management network element of the PS network after receiving the 1x Handoff Complete message sent by the UE. Send a message. In the embodiment of the present invention, the Handoff Complete message and the Assignment Complete message have different names, but have the same function indicating that the handover is completed, and both may be regarded as the Handoff Complete message.

(2) When the 1x CS IWS is integrated with the mobility management network element of the PS network, the 1x CS MSC receives the Handoff Complete message sent by the 1x CS access network element, and then the mobility management network element or 1x CS IWS of the PS network. Send a Clear Command message to the. In this case, after the integrated network element receives the Clear Command message, the IWS in the integrated network element may convert the Clear Command message into a Handoff Complete message. Alternatively, the integrated network element may assume that a Handoff Complete message has been received after the Clear Command message is received, and then perform the following processing.

(3) When the 1x CS IWS is integrated with the 1x CS MSC, the 1x CS IWS / 1x CS MSC receives the Handoff Complete message sent by the 1x CS access network element, and then handoff completes to the mobility management network element of the PS network. Send a message.

The method for resource processing of the UE in the PS network when the UE is handed over from the PS network to the CS network has been described above. The following describes the mobility management network element and communication system in the PS network, configured to perform resource processing of the UE in the PS network when the UE is handed over from the PS network to the CS network. Various processing methods, as well as a detailed description of the features in the method, may be applied to the mobility management network element and communication system of the PS network, which will be described below.

10 shows a structure of a communication system according to an embodiment of the present invention. Referring to FIG. 10, a communication system includes a mobility management network element 101 in a PS network and an access network 103 of a PS network. When the UE is handed over from the PS network to the CS network, the access network 103 of the PS network is configured to send a Release Request message to the mobility management network element of the PS network, and the mobility management network element 101 of the PS network. Is configured to receive a Release Request message sent by the access network of the PS network and process resources of the UE in the PS network.

In the case of GERAN / UTRAN networks, the mobility management network element of the PS network may be SGSN, and in the case of E-UTRAN, the mobility management network element of the PS network may be MME. Therefore, the access network of the PS network may correspond to the access network in various PS networks.

The detailed procedure for handing over the UE from the PS network to the CS network is similar to that described in the embodiments of FIGS. 7 and 8, and thus will not be described in detail herein. After receiving the Handoff Direction message sent by the mobility management network element of the PS network, the access network of the PS network sends a Release Request message to the mobility management network element of the PS network, or sends an RRC Release Request message sent by the UE. After receiving, it sends Release Request message to mobility management network element of PS network. The RRC Release Request message may be sent by the UE to the access network of the PS network after the UE receives the Handoff Direction message. The RRC Release Request message may further include indication information indicating that the RRC Release Request is generated by handing over the UE to the CS network. For example, the UE may include a "Cause" information element (IE) in the RRC Release Request message, and the value of the IE is set to "Handover Triggered" or the UE may request an RRC Release Request. The message may include a "Handover Triggered Indicator" IE. The access network of the PS network may be configured to include, in the Release Request message sent to the mobility management network element of the PS network, indication information indicating that the Release Request is generated by handing over the UE to the CS network. For example, the access network of the PS network may include a "Cause" information element (IE) in the Release Request message, and the value of the IE is set to "Handover Triggered" or the access network of the PS network. This Release Request message may include a "Handover Triggered Indicator" IE.

The mobility management network element of the PS network may process resources of the UE in the PS network according to one of the following schemes.

(1) The mobility management network element of the PS network initiates an implicit user separation process for separating the UE from the PS network. If the UE is detached from the PS network, the bearer is deleted from the PS network.

(2) The mobility management network element of the PS network does not separate the UE (ie, reserves the MM context of the UE). In the case of a GBR bearer, the mobility management network element of the PS network initiates a bearer deletion process for deleting a bearer. In the case of non-GBR bearers, the mobility management network element of the PS network reserves these bearers and instructs the SGW to withhold these bearers. The mobility management network element of the PS network may instruct the SGW to hold a bearer in the manner described below.

(a) The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. For each bearer to withhold, the Update Bearer Request message includes the bearer's ID and the bearer's status. The mobility management network element of the PS network sets the state of the bearer to "suspend".

(b) The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. For each bearer to hold, the Suspend Bearer Request message contains the ID of the bearer to hold.

After receiving the bearer hold indication, the SGW sets the state of the bearer to "suspend".

The SGW receives the downlink data packet for the held bearer without triggering paging. The SGW may buffer these downlink data packets or may release resources used by the held bearer between the SGW and the downlink user side network element, for example the downlink TEID used by the held bearer. have. For example, in the case of an E-UTRAN network, the SGW releases resources between the SGW and the eNodeB, and in the case of a UTRAN network, the SGW releases resources between the Radio Network Controller (RNC) or the 3G SGSN. In the case of a GERAN network, the SGW releases resources with the 2G SGSN.

(3) The mobility management network element of the PS network does not separate the UE (ie, reserves the MM context of the UE). In the case of a VoIP bearer, the mobility management network element of the PS network initiates a bearer deletion process for deleting the bearer, and for some other bearers, the mobility management network element of the PS network reserves the bearer and causes the SGW to bear the bearer. Instruct them to withhold.

(4) The mobility management network element of the PS network does not separate the UE (ie, reserves the MM context of the UE). In the case of a bearer, the mobility management network element of the PS network reserves these bearers and instructs the SGW to hold the bearer. The mobility management network element of the PS network may instruct the SGW to hold the bearer in the following manner.

(a) The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. For each bearer to hold, the Update Bearer Request message includes the bearer's ID and the bearer's status. The mobility management network element of the PS network sets the state of the bearer to "suspend".

(b) The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the bearer status and the ID of the UE. The mobility management network element of the PS network sets the state of the bearer to "suspend".

(c) The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. For each bearer to hold, the Suspend Bearer Request message contains the ID of the bearer to hold. After receiving the Suspend Bearer Request message, the SGW sets the state of the bearer corresponding to the bearer ID to "suspend".

(d) The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes the ID of the UE. After receiving the Suspend Bearer Request message, the SGW sets the state of all bearers of the UE to "suspend".

Note: The mobility management network element of the PS network may instruct the SGW to hold all bearers of the UE. The mobility management network element of the PS network, depending on the type of bearer, reserves some bearers (eg, non-GBR bearers) and deletes some other bearers (eg, GBR bearers or VoIP bearers). Initiate the bearer deletion process.

The mobility management network element of the PS network, depending on the type of bearer, deletes some bearers, reserves some other bearers (eg, non-GBR bearers), and instructs the SGW to withhold the reserved bearers. do. After receiving the Suspend Bearer message, the SGW withholds the reserved bearer and deletes the non-reserved bearer (i.e., the SGW deletes the non-pending bearer, for example GBR bearer or VoIP bearer).

The mobility management network element of the PS network deletes some bearers, reserves some other bearers (eg, non-GBR bearers), and instructs the SGW to withhold the reserved bearers, depending on the type of bearers. [As described in the method (4), the mobility management network element of the PS network sends a Suspend Bearer Request message including the ID of the UE to the SGW. After receiving the Suspend Bearer message, the SGW suspends the reserved bearer (e.g., non-GBR bearer) and deletes the non-reserved bearer (i.e., the SGW does not hold the bearer, e.g. GBR bearer or Delete the VoIP bearer).

The mobility management network element of the PS network, depending on the type of bearer, deletes some bearers, reserves some other bearers, and instructs the SGW to withhold the reserved bearers and delete those not reserved. One of four methods described below can be used.

Method 1: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the status of the bearer, the ID of the bearer to be deleted, and the ID of the bearer to be held. The state of the bearer to be held is set to "suspend", and the state of the bearer to be deleted is set to "delete". After receiving the Update Bearer Request message, the SGW withholds the bearer corresponding to the ID of the bearer to be held and deletes the bearer corresponding to the ID of the bearer to be deleted.

Method 2: The mobility management network element of the PS network sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes a suspend list of IDs of bearers to be suspended and a delete list of IDs of bearers to be deleted. After receiving the Update Bearer Request message, the SGW withholds the bearer corresponding to the pending list and deletes the bearer corresponding to the deletion list.

Method 3: The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes a pending list of IDs of bearers to be suspended and a deletion list of IDs of bearers to be deleted. After receiving the Suspend Bearer Request message, the SGW sets the status of the bearer corresponding to the ID of the bearer to be held to "suspend" and deletes the bearer corresponding to the deletion list.

Method 4: The mobility management network element of the PS network sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes a deletion list consisting of the ID of the UE and the ID of the bearer to be deleted. After receiving the Suspend Bearer Request message, the SGW deletes the bearer corresponding to the deletion list and suspends other bearers.

The communication system interacts with the mobility management network element of the PS network, provides radio resources for handover of the UE, and sends a Handoff Complete message to the mobility management network element of the PS network after the handover of the UE is completed. It may further comprise a CS network. The mobility management network element of the PS network sends a Handoff Complete message to the UE through the access network of the PS network. Hereinafter, the specific implementation will be described with reference to the embodiments corresponding to FIGS. 7 and 8.

According to the communication system according to the embodiment of the present invention, the access network of the PS network sends a Release Request message to the mobility management network element of the PS network, and the mobility management network element of the PS network is sent by the access network of the PS network. Upon receiving the Release Request message, by processing the resources of the UE in the PS network, when the UE is handed over from the PS network to the CDMA2000 1x network, it is possible to process the resources of the UE in the PS network.

11 shows a structure of a communication system according to another embodiment of the present invention. Referring to FIG. 11, a communication system includes a mobility management network element 111 in a PS network and a CS network 113. When the UE is handed over from the PS network to the CS network, the CS network 113 sends a Handoff Complete message to the mobility management network element of the PS network. The mobility management network element 111 in the PS network receives a Handoff Complete message sent by the CS network and performs processing for resources of the UE in the PS network.

In the case of GERAN / UTRAN network, the mobility management network element of the PS network may be SGSN, and in the case of E-UTRAN, the mobility management network element of the PS network may be MME. The CS network may be a CDMA2000 1x network or a GSM CS network.

Since the detailed procedure for handing over the UE from the PS network to the CS network is shown in the method embodiment of FIG. 9, a detailed description is not made here. The mobility management network element of the PS network processes the resources of the UE in the PS network after receiving the Handoff Complete message.

In addition, the communication system may further include an IWS network element between the CS network and the PS network. The CS network may further include an access network element and a mobility management network element. For example, in a CDMA2000 1x network, the access network element may be led by a 1x CS access network element, and the mobility management network element may be a 1x CS MSC.

The IWS network element mainly performs the function of exchanging and relaying 1x CS signaling, which encapsulates 1x CS signaling from 1x CS MSC, sends the encapsulated 1x CS signaling to the UE through the PS network, or otherwise the UE is encapsulated. 1x CS signaling is sent to the IWS through the PS network, and the IWS relays the encapsulated 1x CS signaling to the 1x CS MSC. In a specific embodiment, the IWS may be an independent network element or may be integrated with other network elements in the network to form an integrated network element. In this case, the following cases may be included.

1. If the IWS is integrated with the access network element of the CS network, this integrated network element sends a Handoff Complete message to the mobility management network element of the PS network after receiving the Handoff Complete message sent by the UE.

2. When the IWS network element is integrated with the mobility management network element of the PS network, the access network element of the CS network sends a Handoff Complete message to the mobility management network element of the CS network. The mobility management network element of the CS network sends a Clear Command message to the unified network after receiving the Handoff Complete message sent by the access network element of the CS network.

3. If the IWS between the CS network and the PS network is an independent network element, the access network element of the CS network sends a Handoff Complete message to the mobility management network element of the CS network. The mobility management network element of the CS network sends a Clear Command message to the IWS after receiving the Handoff Complete message sent by the access network element of the CS network. After receiving the Clear Command message sent by the mobility management network element of the CS network, the IWS network element sends a Handoff Complete message to the mobility management network element of the PS network.

4. When the IWS is integrated with the mobility management network element of the CS network, the integrated network element receives a Handoff Complete message sent by the access network of the CS network, and then sends a Handoff Complete message to the mobility management network element of the PS network. Send it.

The method used by the mobility management network element of the PS network for processing resources of the UE in the PS network after receiving the Handoff Complete message may be different from the method used by the mobility management network element of the PS network in the above-described embodiment. Since it is the same, detailed description is not given.

12 illustrates a structure of a mobility management network element in a PS network according to an embodiment of the present invention. Referring to FIG. 12, the mobility management network element includes a receiving unit 121 and a resource processing unit 123. When the UE is handed over from the PS network to the CS network, the receiving unit 121 receives a Release Request message sent by the access network of the PS network or a Handoff Complete message sent by the CS network. The resource processing unit 123 processes the resources of the UE in the PS network after the receiving unit 121 receives the Release Request message sent by the access network of the PS network or the Handoff Complete message sent by the CS network. .

In the case of GERAN / UTRAN network, the mobility management network element of the PS network may be SGSN, and in the case of E-UTRAN, the mobility management network element of the PS network may be MME.

The detailed procedure for handing over the UE from the PS network to the CS network is similar to that described in the method embodiments of FIGS. 7, 8, and 9 and will not be described in detail herein.

13 illustrates a structure of a mobility management network element in a PS network according to another embodiment of the present invention. Referring to FIG. 13, the mobility management network element includes a receiving unit 121 and a resource processing unit 123. Based on the embodiment corresponding to FIG. 12, the receiving unit 121 may further include a first receiving module 1211 and / or a second receiving module 1213.

The first receiving module 1211 is configured to receive a Release Request message sent by the access network of the PS network when the UE is handed over from the PS network to the CS network. The Release Request message may further include indication information indicating that the Release Request is generated by handing over the UE to the CS network. For example, a Release Request message may contain a "Cause" information element (IE), the value of IE may be set to "Handover Triggered", or the Release Request message may be set to "Handover Triggered Indicator". Over trigger indication) IE. After receiving the Release Request message sent by the access network of the PS network, the first receiving module 1211 includes, in the Release Request message, indication information indicating that the Release Request is generated by handing over the UE to the CS network. If found, the first receiving module 1211 notifies the resource processing unit 123 to process resources of the UE in the PS network.

The second receiving module 1213 is configured to receive a Handoff Complete message sent by the CS network when the UE is handed over from the PS network to the CS network, and specifically includes the following situation.

1. When the IWS between the CS network and the PS network is integrated with the access network element of the CS network, the second receiving module 1213 is configured to receive a Handoff Complete message sent by the access network element of the CS network.

2. When the IWS network element between the CS network and the PS network is integrated into the mobility management network element of the PS network, the second receiving module 1213 is configured to receive a Clear Command message sent by the mobility management network element of the CS network. .

3. If the IWS between the CS network and the PS network is an independent network element, the second receiving module 1213 is configured to receive a Handoff Complete message sent by the IWS network element, and the IWS network element is a mobility management network element of the CS network. After receiving the Clear Command message sent by the, it sends a Handoff Complete message to the second receiving module 1213.

4. If the IWS network element between the CS network and the PS network is integrated into the mobility management network element of the CS network, the second receiving module 1213 receives a Handoff Complete message sent by the mobility management network element of the CS network.

After receiving the Handoff Complete message sent by the CS network, the second receiving module 1213 notifies the resource processing unit 123 to process resources of the UE in the PS network.

In addition, the resource processing unit 123 may include at least one of the modules described below:

A first resource processing module 1231 configured to initiate an implicit user separation process for separating the UE from the PS network;

A second resource processing module 1233, configured to reserve all bearers of the UE in the PS network and to instruct the SGW to withhold the reserved bearer; And

A third resource configured to initiate a bearer deletion process for deleting bearers corresponding to some bearers, to retain bearers corresponding to some other bearers, and to instruct the SGW to withhold the reserved bearers according to the type of bearers Processing Module 1235. For example, in the case of a GBR bearer, the third resource processing module 1235 initiates a bearer deletion process for deleting the bearer, and in the case of a non-GBR bearer, the third resource processing module 1235 is non- Reserve the GBR bearer and instruct the SGW to hold the non-GBR bearer.

In contrast, in the case of a VoIP bearer, the third resource processing module 1235 initiates a bearer deletion process for deleting a bearer, and for a bearer other than the VoIP bearer, reserves other bearers other than the VoIP bearer and returns to the SGW. Instructs to hold a bearer other than the VoIP bearer. By doing so, the first voice bearer of the UE in the PS network can be released in time, and other non-voice bearers can be reserved and withheld. Thus, the UE can continue to provide service to the user even after returning to the PS network.

In an embodiment of the present invention, the resource processing unit may further include one or more of the following modules or various modules of the following and the first resource processing module, the second resource processing module, and the third resource processing module. Combinations.

A fourth resource processing module according to the type of bearer, deleting some bearers, retaining other bearers, and instructing the SGW to hold the reserved bearers;

A fifth resource processing module configured to instruct the SGW to hold all bearers of the UE, and according to the bearer type, to reserve some bearers and to initiate a bearer deletion process for deleting other bearers;

A sixth resource processing module configured to cause the SGW to hold all bearers of the UE, delete some bearers, and reserve other bearers according to the bearer type; And

A seventh resource processing module arranged to delete some bearers according to the bearer type, to reserve some other bearers, and to instruct the SGW to withhold the reserved bearers and delete the non-reserved bearers.

The resource processing module 123 further includes one or more of the first bearer hold module 1237, the second bearer hold module 1239, the third bearer hold module 1241, and the fourth bearer hold module 1243. can do. The second resource processing module 1233, the third resource processing module 1235, or the fourth resource processing module transmits an ID of a bearer to be held to the first bearer holding module 1237 or the second bearer holding module 1239. Can ship. Alternatively, the second resource processing module 1233, the fifth resource processing module, or the sixth resource processing module may set the ID of the UE to the third bearer hold module 1241 or the first to instruct to hold all bearers of the UE. 4 Bearer holding module 1243. The first bearer hold module 1237 receives an ID of a bearer to hold and sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the ID of the bearer to be held and the status of the bearer, and the status of the bearer is set to "suspend".

The second bearer hold module receives an ID of a bearer to hold and sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes the ID of the bearer to be held, and the Suspend Bearer Request message instructs the SGW to set the state of the bearer corresponding to the bearer's ID to "suspend".

The third bearer hold module receives the ID of the UE to hold, and sends an Update Bearer Request message to the SGW. The Update Bearer Request message includes the bearer status and the ID of the UE. The state of the bearer is set to "suspend". The Update Bearer Request message instructs the SGW to set the state of all bearers of the UE to "suspend."

The fourth bearer hold module receives the ID of the UE to hold and sends a Suspend Bearer Request message to the SGW. The Suspend Bearer Request message includes the ID of the UE, and the Suspend Bearer Request message instructs the SGW to set the state of all bearers of the UE to "suspend".

The seventh resource processing module may further include one or more of the following subunits.

A first processing subunit that sends an Update Bearer Request message to the SGW that includes the ID of the bearer to be held, the ID of the bearer to be deleted, and the status of the bearer, wherein the status of the bearer to be held is set to " suspend " A first processing subunit, in which the bearer's state is set to "delete";

A second processing subunit for sending an Update Bearer Request message to the SGW, the Update Bearer Request message including a pending list consisting of the IDs of bearers to be held and a deletion list consisting of the IDs of bearers to be deleted;

A third processing subunit for sending a Suspend Bearer Request message to the SGW, the Suspend Bearer Request message including a pending list of IDs of bearers to be held and a deletion list of IDs of bearers to be deleted; And

And a fourth processing subunit, which sends a Suspend Bearer Request message to the SGW, which includes a deletion list consisting of the ID of the UE and the ID of the bearer to be deleted.

The SGW receives the downlink data packet for the held bearer, without triggering paging, after holding the bearer. The SGW may buffer these downlink data packets and may release resources used by the reserved bearer between the SGW and the downlink user side network element, for example the downlink TEID used by the reserved bearer. . For example, in the case of an E-UTRAN network, the SGW releases resources between the SGW and the eNodeB, and in the case of a UTRAN network, the SGW releases resources between the Radio Network Controller (RNC) or the 3G SGSN. In the case of a GERAN network, the SGW releases resources with the 2G SGSN.

According to the mobility management network element in the PS network according to the embodiment of the present invention, the receiving unit 121, when the UE is handed over from the PS network to the CS network, the Release Request message sent by the access network of the PS network or By receiving a Handoff Complete message sent by the CS network and receiving a Release Request message sent by the access network of the PS network or a Handoff Complete message sent by the CS network, by processing resources of the UE in the PS network, When the UE is handed over from the PS network to the CS network, it can process the resources of the UE in the PS network.

While the embodiments of the present invention have been described above, those skilled in the art can understand that the present invention can be implemented through software on a general purpose hardware platform, or through hardware (preferably implemented in software). will be. Thus, technical solutions or parts of the prior art of the present invention may be provided in the form of a software product. The computer software product is stored in a readable recording medium such as a floppy disk, hard disk, or optical disk of a computer, and the computer device (e.g., a personal computer, server, or network equipment) is described in the embodiments of the present invention. Contains instructions to instruct the method to be performed.

The above description is only a preferred embodiment of the technical problem of the present invention, and should not be construed as limiting the protection scope of the present invention. All changes, modifications and equivalents should be construed as being included within the scope of the present invention without departing from the principles of the invention.

Claims (21)

As a method for processing resources,
When a mobility management network element of a packet switched network (PS) is handed over from a user equipment (UE) to a circuit switched network (CS) from the PS network Receiving a Release Request message sent by an access network of the PS network or a Handoff Complete message sent by the CS network; And
The mobility management network element of the PS network processing resources of a user terminal (UE) in the PS network
Including,
When the mobility management network element of the PS network processes resources of a user terminal (UE) in the PS network, the mobility management network element of the PS network may delete some bearers according to the bearer type, and Including holding some bearers,
Resource processing method. The method of claim 1,
Before the mobility management network element of the PS network performs the step of receiving a Release Request message sent by the access network of the PS network, the access network of the PS network is the mobility management network of the PS network. Receiving a Handoff Direction message sent by the element, and then sending a Release Request message to the mobility management network element of the PS network. The method of claim 1,
In the resource processing method, before the mobility management network element of the PS network performs the step of receiving a Release Request message sent by the access network of the PS network, the access network of the PS network is selected by a user. After receiving a radio resource control (RRC) Release Request message sent by the UE, sending a Release Request message to the mobility management network element of the PS network;
The RRC Release Request message is sent by the user terminal to the access network of the PS network after the UE receives a Handoff Direction message. , How resources are handled. The method of claim 3,
The RRC Release Request message sent by the UE and received by the access network of the PS network is an RRC Release Request. And the indication information indicating that the result is caused by handover. The method of claim 1,
The Release Request message received by the mobility management network element of the PS network further includes indication information indicating that a Release Request is generated by handing over a UE to the CS network. ,
The mobility management network element of the PS network processes resources of a user terminal (UE) in the PS network according to the indication information. The method of claim 1,
Receiving a Handoff Complete message sent by the CS network by the mobility management network element of the PS network,
If an interworking solution function (IWS) network element between the CS network and the PS network is integrated with an access network element of the CS network, the access network of the CS network is a user terminal. After receiving a Handoff Complete message sent by (UE), sending the received Handoff Complete message to the mobility management network element of the PS network; or
When the IWS network element between the CS network and the PS network is integrated with the mobility management network element of the PS network, the mobility management network element of the CS network is handed off by the access network element of the CS network. Sending a Clear Command message to the mobility management network element of the PS network after receiving the (Handoff Completed) message; or
If the IWS between the CS network and the PS network is an independent network element, after the mobility management network element of the CS network receives a Handoff Complete message sent by an access network element of the CS network Sending a Clear Command message to the IWS network element, and the IWS network element sending a Handoff Complete message to the mobility management network element of the PS network; or
When the IWS network element between the CS network and the PS network is integrated with the mobility management network element of the CS network, the mobility management network element of the CS network is handed off by the access network element of the CS network. After receiving a (handoff complete) message, sending a Handoff Complete message to a mobility management network element of the PS network. The method of claim 1,
The mobility management network element of the PS network, depending on the type of bearer, deleting some bearers and withholding other bearers,
The mobility management network element of the PS network initiates a bearer deletion process for deleting some bearers according to the bearer type, reserves other bearers, and causes the serving gateway (SGW) to reserve. Instructing to hold the bearer; or
The mobility management network element of the PS network instructs the SGW to hold all bearers of the UE, and the mobility management network element of the PS network reserves some bearers, depending on the type of bearer. Initiating a bearer deletion process for deleting another part of the bearer; or
The mobility management network element of the PS network, depending on the type of bearer, deletes some bearers, reserves some other bearers, instructs the SGW to hold the reserved bearers, and the SGW reserves the reserved bearers. Deleting a bearer that has been suspended and not reserved; or
The mobility management network element of the PS network, according to the type of bearer, deletes some bearers, reserves some other bearers, instructs the SGW to hold all bearers of the UE, and After the SGW receives the Suspend Bearer Request message, depending on the type of bearer, deleting some bearers and reserving some other bearers; or
The mobility management network element of the PS network, according to the type of bearer, deletes some bearers, reserves some other bearers, and instructs the SGW to hold the reserved bearers and delete the non-reserved bearers. And processing the resource. The method of claim 1,
Suspending some other bearer according to the bearer type,
The mobility management network element of the PS network transmits an Update Bearer Request (bearer update request) message including an ID of a bearer to be held and a bearer state set to "suspend" to a serving gateway (SGW). Shipping; or
After the mobility management network element of the PS network sends a Suspend Bearer Request message including a bearer ID to be held to the SGW, and the SGW receives a Suspend Bearer Request message. Setting a state of a bearer corresponding to an ID of the bearer to "suspend"; or
The mobility management network element of the PS network sends to the SGW an Update Bearer Request message including an ID of a user terminal (UE) and a bearer state set to "suspend". Setting a state of all bearers of the user terminal UE to “suspend”; or
The mobility management network element of the PS network sends a Suspend Bearer Request message including an ID of a user terminal (UE) to the SGW, and the SGW receives a Suspend Bearer Request message. And then setting the state of all bearers of the user terminal (UE) to " suspend. &Quot; The method of claim 7, wherein
The mobility management network element of the PS network instructing the SGW to hold a reserved bearer and to instruct to delete a bearer not reserved,
The mobility management network element of the PS network includes an ID of a bearer to be held, an ID of a bearer to be deleted, a state of a bearer to be set to "suspend", and a state of a bearer to be set to "delete". Sending an Update Bearer Request message to the SGW; or
Sending, by the mobility management network element of the PS network, to the SGW an Update Bearer Request message including a pending list consisting of the ID of the bearer to be held and a deleting list consisting of the ID of the bearer to be deleted; or
Sending, by the mobility management network element of the PS network, to the SGW a Suspend Bearer Request message including a pending list consisting of the ID of the bearer to be suspended and a deleting list consisting of the ID of the bearer to be deleted; or
Sending, by the mobility management network element of the PS network, to the SGW a Suspend Bearer Request message comprising a deletion list consisting of an ID of a user terminal (UE) and an ID of a bearer to be deleted. Treatment method. A mobility management network element 101 of a packet switched network (PS); And
An access network 103 of the PS network
/ RTI >
When a user equipment (UE) is handed over from the PS network to a circuit switched (CS) circuit, the access network of the PS network sends a Release Request message to the mobility management network element of the PS network. Send a message, and the mobility management network element of the PS network receives a Release Request message sent by the access network of the PS network to process resources of a user terminal (UE) in the PS network;
When the mobility management network element of the PS network processes resources of a user terminal (UE) in the PS network, the mobility management network element of the PS network deletes some bearers according to the type of bearer, and another part Including suspending the bearer of
Communication system. The method of claim 10,
The access network of the PS network, after receiving a Handoff Direction message sent by the mobility management network element of the PS network, releases a Release Request message to the mobility management network element of the PS network. A communication system, adapted to send a message. The method of claim 10,
After the access network of the PS network receives a radio resource control (RRC) Release Request message sent by a user terminal (UE), the access network releases a request to the mobility management network element of the PS network. Send a message,
The RRC Release Request message is to be sent by the user terminal (UE) to the access network of the PS network after the user terminal (UE) receives a Handoff Direction message. system. The method of claim 11,
The access network of the PS network is generated by a Release Request handing over a user terminal (UE) to the CS network in a Release Request message sent to the mobility management network element of the PS network. And further comprising indicating indication information. A mobility management network element in a packet switched network (PS),
When a user equipment (UE) is handed over from the PS network to a circuit switched network (CS), a Release Request message sent by an access network of the PS network. Or a receiving unit 121 configured to receive a Handoff Complete message sent by the CS network; And
After the receiving unit receives a Release Request message sent by an access network of the PS network or a Handoff Complete message sent by the CS network, a user terminal (UE) in the PS network. Resource processing unit 123 configured to process resources
Including,
The resource processing unit 123 deletes some bearers according to the type of bearer, reserves some other bearers, and instructs a serving gateway (SGW) to hold the reserved bearers. Included,
Mobility Management Network Element. 15. The method of claim 14,
The receiving unit 121,
In the case where the UE is handed over from the PS network to the circuit switched (CS) network, the indication information indicating that the release request is generated by handover of the UE to the CS network is included. A first receiving module 1211, adapted to receive a Release Request message from the access network of the PS network; And
A second receiving module 1213, configured to receive a Handoff Complete message sent by the CS network when the UE is handed over from the PS network to a circuit switched (CS) network. More,
If an interworking solution function (IWS) network element between the CS network and the PS network is integrated with an access network element of the CS network, the second receiving module is configured to provide the CS network. Receive a Handoff Complete message sent by an access network element of; or
When the IWS network element between the CS network and the PS network is integrated with the mobility management network element of the PS network, the second receiving module sends a Clear Command (Clear Command) sent by the mobility management network element of the CS network. Command) to receive the message; or
When the IWS network element between the CS network and the PS network is an independent network element, the second receiving module is configured to receive a Handoff Complete message sent by the IWS network element. The IWS network element sends a Handoff Complete message to the second receiving module after receiving the Clear Command message sent by the mobility management network element of the CS network; or
If the IWS network element between the CS network and the PS network is integrated with the mobility management network element of the CS network, the second receiving module 1213 is a handoff sent by the mobility management network element of the CS network. Mobility management network element configured to receive a Complete (Handoff Complete) message. 15. The method of claim 14,
The resource processing unit 123 further includes one or more of a first bearer hold module 1237 and a second bearer hold module 1239,
The resource processing module sends an ID of a bearer to be held to the first bearer holding module or the second bearer holding module,
The first bearer holding module receives an ID of a bearer to hold, and sends an Update Bearer Request message to the SGW including an ID of the bearer to be held and a status of a bearer set to "suspend". Are supposed to be sent out,
The second bearer hold module receives an ID of a bearer to hold, and the second bearer hold module includes an ID of a bearer to hold, and causes the SGW to "hold" the state of the bearer corresponding to the bearer's ID. A mobility management network element adapted to send a Suspend Bearer Request message to the SGW instructed to set to "suspend." delete delete delete delete delete

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